Application method and attention of high purity hydrogen in atmosphere furnace

Time：2022-03-18

Application method and attention of high purity hydrogen in atmosphere furnace
1. Check the air tightness of the furnace. After installing the flange, maintain the pressure for 2 hours to see whether the pressure gauge deflects and proceed to the next step when the air tightness is intact.
2. Exhaust the gas in the furnace by pre vacuumizing with vacuum pump:
(1) Connect the air outlet nozzle of the tubular furnace with the vacuum hose.
(2) Pre vacuumize the furnace chamber to -0.08mpa,
(3) then inject protective gas (nitrogen or argon is better),
(4) pre vacuumize the furnace cavity to -0.08mpa
(5) Such cycle several times to meet the atmosphere requirements in the furnace.
3. After the chamber is cleaned, vacuum the furnace body, and then flush hydrogen into it. Since hydrogen is a dangerous gas and its content is between 4% – 75%, it will explode with the air. Therefore, after washing the furnace, be sure to check whether the furnace is cleaned, that is to say
Whether the hydrogen in the furnace is pure. At this time, hydrogen should be purified with hydrogen purification equipment to ensure high purity of hydrogen.
4. After using high-purity hydrogen, let the hydrogen enter from the back and exit from the front. In order to prevent the hydrogen from accumulating too much in the furnace and causing danger due to excessive pressure in the furnace, a good way is to insert the air outlet into the mineral water bottle filled with water. The mineral water bottle should be placed outdoors, turn the air outlet valve to the maximum, and adjust the gas flow through the air inlet valve.
5. Heat the furnace after the gas flow is normal,